linux-kernel - Re: cpufreq: intel_pstate: map utilization into the pstate range

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Message-ID: <alpine.DEB.2.22.394.2201062141290.3098@hadrien>
Date:   Thu, 6 Jan 2022 21:43:12 +0100 (CET)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
cc:     Francisco Jerez <currojerez@...eup.net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: cpufreq: intel_pstate: map utilization into the pstate range

> > All the turbostat output and graphs I have sent recently were just
> > for
> > continuous spinning:
> >
> > for(;;);
> >
> > Now I am trying running for the percentage of the time corresponding
> > to
> > 10 / P for pstate P (ie 0.5 of the time for pstate 20), and then
> > sleeping,
> > to see whether one can just add the sleeping power consumption of the
> > machine to compute the efficiency as Rafael suggested.
> >
> Before doing comparison try freezing uncore.
>
> wrmsr -a 0x620 0x0808
>
> to Freeze uncore at 800MHz. Any other value is fine.

Thanks for the suggestion.  What is the impact of this?

julia